@boomerang,
Sounds proper at 4th grade level.
We had reports book , spelling and vocabulary (definition to each spelling word) weekly. 3rd grade words included bicycle, church (those stuck in my head) and finger and admire seem raher simple words. Those worksheets seem like a new fangled idea, yet pages of 4 total doesn't seem too brutal, it's a sheet a day, We did have essays though and creative writing (there was a sci-fi tale I wrote which earned me a nice blue sticky star.)
We also had some math, 4th grade brought us long division (which I still can't do) but it was part of regular homework, followed the next mooring with victims going to the board and writing out the problem and solution. We had a history book as well (a nice drawing of that Balboa guy standing in the Pacific Ocean). They weren't keen on the sciences though.
In addition to school work and homework, there were household chores (dishwashing, vacuuming and dusting a random room- we picked a slip of paper from a cookie tin and collecting the laundry off the clothesline) the tasks varied depending on where I was located. In the city we also got sent for the dry cleaning pickup, up north we had to rake leaves, mow a lawn.
4th and 5th grade I had after school violin lessons a few times week (I still can't play a violin)
Then again, I rarely did my homework and spelling came easy for me as did writing reports, (I did my 10th grade Economics term paper on a Saturday morning (music of the Great Depression))
At various intervals there were animals to tend to- walk a dog or two, feed the gerbils, bury the gerbils, clean the bird cages, etc. etc.
Sorry the kid is having a tough time with subs. that sounds like my 2nd grade experience, it straightened out about May when we got a perm. teacher., it teaches a lesson to work your best no matter who you work for.
I have no idea how long homework took, in the rare instances I bothered with it, I could complete it before dinner (on non after school activity nights) In the city that meant between 3:30 and 6:00 P.M. and included setting a dinner table or some other task, every night. My uncle believed in a good work ethic. Keep in mind, the routines learned now will help your child in the future as he learn to apply himself.
Along way the he will learn time management.
I can't emphasize enough the importance of learning to apply ones self early, the lesson lasts a lifetime.
(It scares me much how I remember)